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@nitro tutes gatitt @with Letters Paten-t No. 73,999, dated February 4, 1868.

IMPROVEMENT IN DNB-SPRINGS.

@Le flphnle referat tu it these glitters tant zmrmtiing grazi. rf the time T() ALL WHOM IT MAY CONGERN:

Be it known that I, LL C. PRINDLE, of Chicago, in the county of Cook, inthe State of Illinois, have invented an Improved Door and Gate-Spring; and I do hereby declare that the following is a full and .exact descriptiom thereof, reference being ha'd to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification, in which Figure Il is an elevation of my invention as applied to a door.

Figure 2, an elevation of thejamb and the plate which holds one end lof the spring in place.

Figure 3, a plan view of the spring before being coiled, and the plate to which it is attached.

Figure 4, an end elevation of' the spring ai'ter it has been coiled.

The nature of my invention consists in the use of a peculiar-arranged spring, in combination `with plates attached to the door and jamb, for the purpose of causing the door to shut after it has been opened, and in constructing said spring and plates so as to be 'applicable to any common door or gat/e now in use.,

ln order to give aeorrect understanding of my invention, have marked corresponding parts with similar letters, and will now give a detailed description. v v

D, iig, 3, represents a plate cut'from 'tine spring-steel, and formed into a coil-shape, as seen at fig. 4, by means of any common machinery used for such a purpose, and in such a manner as will leave the ends G F projecting outward from the coil, as seen in the last-named figure. The end F, I secure to a plate, E, ig.v3.,v made i'a-st to thejamb B, gsl, in the usual manner, and the end G is fitted in a slot, a, g. 2, made between a plate, H, secured to doel` A, and the gain in which said plate is fitted and secured, and in such a. manner that said end Gr may be raised out of slot a, when the door A is to be removed from hinges e e, fig. 1, as is now the case when loose jointebutts are used.

This arrangement I consider'itnportant, for it can be applied to any common door or gate, and cause the same to shut; and, further, it has an advantage over other springs, from'the fact that the end Gr can be removed from the slot'a, which,A ywill'lenderthe spring inoperative, as when a door is used in Warm weather.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, ius- A door and gate-spring cut in the form shown, and coiled so as to have projections F and Gr, in combina.-l tion with plates E H, substantially as and for the purposes herein specified.

` L. C. PRINDLE.

Witnesses:

G. L. CHAPIN, A. HAYWARD. 

